Magnetic Force

This is the force that exists between two magnetic poles. It is related to the electric force and occurs when electric charges move around or with a material with magnetic properties, such as lodestone or a magnet.

Mass

The amount of matter in an object. Mass is not the same as size. Objects with more matter will have a greater mass. Objects with more mass will weigh more, but weight changes depending on the gravitational force.

Matter

Meter

Meson

Fundamental particles combine in different ways to make other particles. Mesons are particles that are made of a quark (of one color) and an anti-quark (with the anti-color of the quark). Here are Ushi (up quark) and Ujana (anti-up quark) in the meson we call the pi-0 (pronounced pie-zero).

Molecule

A group of two or more atoms held together by a chemical bond, a force of electromagnetic attraction. Molecules can be made of only one element such as oxygen (O2) or multiple elements such as water (H2O).